Mold for concrete structures.



PATENTED MAY 31. 1904.

D. W; BOYES.

MOLD FOR'OONGRETE STRUCTURES. APPLICATION FILED JULY 1a, 1903.

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UNITED STATES Patented May 31, 1904:.

PATENT OFFICE.

MOLD FOR CONCRETE STRUCTURES- SPECIFICATION forming part of Letters Patent N0. 761,141, dated May 31, 1904. Application filed July 18, 1903. Serial No. 166,070. (No model.)

To all, whom, it may concern.-

Be it known that I, DAVID W. BoYEs, a citizen of the United States, residing at Grand Rapids, in the county of Kent and State of Michigan, have invented certain new and useful Improvements in Molds for Concrete Structures; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in molds for making concrete structures, and more particularly for sand-traps and cisterns; and its object is to provide the same with certain new and useful features hereinafter more fully described, and particularly pointed out in the claims, reference being had to the accompanying drawings, in which- Figure 1 is a plan view of the inner wall of the cone-top; Fig. 2, a vertical section of they same on the line 2 2 of Fig. 1; Fig. 3, a plan view of the outer wall of the cone-top; Fig. 4, a vertical section of the same on the line 4. 4 of Fig. 3; Fig. 5, a plan view of the molds for the side of the structure; Fig. 6, a side elevation of the same; Figs. 7 and8', details in elevation of two sections of the same, and Figs. 9 and 10' a plan view of the parts shown in Figs. 7 and 8.

Like letters refer to like parts in all of the figures.

To form the cylindrical vertical wall of the structure and to provide a removable inner mold for the same, I provide any convenient number of oppositely-tapered vertically-divided sections A and B to form a tubular structure (four being shown) and provide each section at its respective edges with an inwardly-turned flange C, perforated for bolts to attach it to the corresponding flange on the adjacent section. The outer wall of the mold is preferably formed of the earth in which the structure is located and excavated to form a suitable opening in the earth of sufficiently greater diameter than the mold herein shown to permit of placing the concrete around said mold, or a similar series of oppositely-tapered staves with the flanges omitted may be used to provide an outer wall, if occasion requires. After the concrete has been placed in position and has properly set this mold is readily re moved from the interior thereof by removing the bolts from the flanges C. Any one of the sections A, which are narrower at the bottom than at the top, can be readily moved vertically and the remainder of the sections thus released. After this has been done the inner cone (shown in Figs. 1 and 2) is placed in position above the wall thus formed and the outer cone (shown in Figs-3 and. 4.) placed above the inner cone, with sufficient space between to form a truncated conical top of the structure by placing concrete between these two cones.

The outer cone for convenience in handling is divided into a number of segments G, with outwardly-turned flanges H, secured to each other by suitable bolts. These bolts can be readily removed after the concrete has set and the outer cone removed therefrom. For structures of moderate size this outer case may be made integral, if preferred.

To permit detachment of the inner cone, the same is divided into any convenient number of segments D, and each segment is provided with inwardly-turned flanges E at its respective edges, and these segments are sufficiently less than the complete circumference of the cone to permit of inserting filling-pieces F, of wood or other suitable material, and suitable boltsare then inserted in said flanges C and filling-pieces F to hold the cone in place. By removing the bolts and filling-pieces F the segments can be displaced inward and passed out through the opening in the conical top of the structure. This core is necessarily sectional and provided with filling-pieces, but when bolted together can be placed in position as though integral, and the filling-pieces are securely held in place by the bolts when in use.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a mold for concrete structures, a truncated conical inner mold comprising a series of segments, inwardly-turned flanges on the segments, filling-pieces between the flanges, and bolts extending through the flanges and filling-pieces.

2. In amold for concrete structures, thecombination of a truncated conical inner mold comprising a series of segments, inwardly-turned flanges on the segments, filling-pieces between the flanges, bolts extending through the flanges and filling-pieces, an inner Wall comprising detachable sections, and an outer truncated conical mold.

3. A mold for concrete structures comprising a series of oppositely-tapered sections having inwardly-projecting flanges, means for attaching the flanges to each other, a truncated conical inner mold consisting of a series of segments having inwardly projecting flanges, fillingpieces between the flanges, means for attaching the flanges and fillingpieces, and an outer truncated conical mold consisting of a series of segments having outwardly-turned flanges, and means for securing the flanges to each other.

In testimony whereof I affix my signature in presence of two witnesses.

DAVID W. BOYES.

Witnesses:

LUTHER V. MOULTON, GEORGIANA 01111012. 

